<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
</html>
<script>
  function IdentityCodeValid(code) {
    var city={11:"北京",12:"天津",13:"河北",14:"山西",15:"内蒙古",21:"辽宁",22:"吉林",23:"黑龙江 ",31:"上海",32:"江苏",33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山东",41:"河南",42:"湖北 ",43:"湖南",44:"广东",45:"广西",46:"海南",50:"重庆",51:"四川",52:"贵州",53:"云南",54:"西藏 ",61:"陕西",62:"甘肃",63:"青海",64:"宁夏",65:"新疆",71:"台湾",81:"香港",82:"澳门",91:"国外 "};
    var tip = "";
    var pass= true;

    if(!code || !/^\d{6}(18|19|20)?\d{2}(0[1-9]|1[12])(0[1-9]|[12]\d|3[01])\d{3}(\d|X)$/i.test(code)){
      tip = "身份证号格式错误";
      pass = false;
    }

    else if(!city[code.substr(0,2)]){
      tip = "地址编码错误";
      pass = false;
    }
    else{
      //18位身份证需要验证最后一位校验位
      if(code.length == 18){
        code = code.split('');
        //∑(ai×Wi)(mod 11)
        //加权因子
        var factor = [ 7, 9, 10, 5, 8, 4, 2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2 ];
        //校验位
        var parity = [ 1, 0, 'X', 9, 8, 7, 6, 5, 4, 3, 2 ];
        var sum = 0;
        var ai = 0;
        var wi = 0;
        for (var i = 0; i < 17; i++)
        {
          ai = code[i];
          wi = factor[i];
          sum += ai * wi;
        }
        var last = parity[sum % 11];
        if(parity[sum % 11] != code[17]){
          tip = "校验位错误";
          pass =false;
        }
      }
    }
    if(!pass) return {msg:tip,code:400};
    return {msg:'符合',code:200};
  }
  var c = '511523199008253074';
  var res= IdentityCodeValid(c);
  console.log(res)
</script>
